Intro to Ruby on Rails

Presented at Back to School with General Assembly on August 29, 2015.

Transcript

1. Intro to Ruby on Rails Anthony Lewis
2. Anthony Lewis • Engineering Team Lead - Sharethrough • Author of Rails Crash Course • @anthonylewis • me@anthonylewis.com • http://anthonylewis.com
3. Session Overview • What is Ruby? • What is Ruby on Rails? • Installation • Ruby Basics • Your First Rails App • Resources
4. What is Ruby?
5. Ruby • A dynamic, open source programming language with a focus on simplicity and productivity. It has an elegant syntax that is natural to read and easy to write. • Created by Yukihiro “Matz” Matsumoto • http://www.ruby-lang.org/en
6. MINASWAN Matz is nice and so we are nice.
7. Gem • RubyGems is the Ruby packaging system. It provides a standard format for distributing Ruby programs and libraries, and an easy to use tool for managing the installation of gem packages. • https://rubygems.org
8. Bundler • Bundler manages an application's dependencies through its entire life across many machines systematically and repeatably. • http://gembundler.com
9. Git • Git is a free & open source, distributed version control system designed to handle everything from small to very large projects with speed and efficiency. • http://git-scm.com • https://github.com
10. What is Ruby on Rails?
11. Rails • An open-source web framework that’s optimized for programmer happiness and sustainable productivity. It lets you write beautiful code by favoring convention over configuration. • Created by David Heinemeier Hanson • http://rubyonrails.org
12. Rails is Opinionated • Rails assumes there is a “best” way to do things and encourages that way. • It includes recommended gems by default • CoffeeScript and jQuery for JavaScript • SASS for CSS • MiniTest for Testing
13. What about an IDE? • Most Rails developers don’t use an IDE • RubyMine (IntelliJ IDEA for Ruby) • https://www.jetbrains.com/ruby/
14. Text Editor • The Classics: Emacs, Vim • Atom • https://atom.io • Sublime Text 2 • http://www.sublimetext.com
15. Installation
16. What You Need • Ruby 2+ • Rails 4+ • SQLite3 • Git 2+
17. Windows • Starting from scratch? • Use Rails Installer • http://railsinstaller.org
18. Mac OS X • Starting from scratch? • Use Rails Installer • http://railsinstaller.org • Use Homebrew? • brew install ruby • Try rbenv
19. Linux • Check your package system • Does it have Ruby 2.0 or later? • Enjoy building from source? • Try rbenv
20. rbenv • For Mac OS X and Linux • Install multiple versions of Ruby • Builds from source - dev tools required • https://github.com/sstephenson/rbenv
21. Ready To Go? • ruby --version • 2 or greater • rails --version • 4 or greater
22. Ruby Basics
23. Interactive Ruby • Open a Command Prompt or Terminal • Type irb and press Enter
24. Numbers & Math irb> 1 + 2 => 3 irb> 2 * 3 => 6 irb> 6 / 3 => 2
25. Floating Point irb> 6 / 3 => 2 irb> 7 / 3 => 2 irb> 7.0 / 3 => 2.33333333333333
26. Strings irb> "Hello" => "Hello" irb> "Hi" + "There" => "HiThere" irb> "Hi" * 3 => "HiHiHi"
27. String Interpolation irb> name = "Tony" => "Tony" irb> "Hi #{name}" => "Hi Tony"
28. • Symbols are used as identifiers in Ruby • They are like an immutable string • Use a single memory address Symbols irb> :hello => :hello
29. Constants • Name must start with an upper case • Typically written in ALL CAPS irb> PI = 3.14 => 3.14 irb> 2 * PI => 6.28
30. Arrays • A list of objects • Enclosed in square brackets irb> list = [1, 2, 3] => [1, 2, 3] irb> list[1] => 2
31. Hashes • A set of key value pairs • Enclosed in curly braces irb> person = {:name => "Tony"} => {:name=>"Tony"} irb> person[:name] => "Tony"
32. Ruby 1.9+ Syntax • Drop the hash rocket • Move the colon to the end of the symbol irb> person = {name: "Tony"} => {:name=>"Tony"} irb> person[:name] => "Tony"
33. Conditionals age = 21 if age < 13 puts "Child" elsif age < 18 puts "Teen" else puts "Adult" end
34. Boolean Logic • Any expression can be treated as a boolean • false and nil are considered false • All other values are true • Use the empty? method to see if a string or collection is empty
35. Iteration • See also the Enumerable module in the Ruby documentation list = [1, 2, 3, 4] list.each do |number| puts number end
36. Methods • A reusable block of code with a name def greet(name = "World") puts "Hello, #{name}" end irb> greet "Hello, World" => nil
37. Classes • A collection of data and methods class Greeter def initialize(name = "World") @name = name end def say_hi puts "Hello, #{@name}" end end
38. Your First Rails App
39. Create The App • Open a command prompt • Create a directory for your code: • mkdir code • cd code • Type this command: • rails new vinyl
41. View The App • Start the development server: • cd vinyl • bin/rails server • Open your web browser: • http://localhost:3000
43. Rails Philosophy • Convention over configuration • Follow the Rails conventions and there will be very little configuration.
44. Rails Philosophy • DRY - Don’t Repeat Yourself • Specifying the same thing in more than one place leads to errors.
45. Rails Architecture • Model • Data and rules for manipulating it. • View • The User Interface • Controller • Glue that ties the UI to the Data.
46. Model View Controller Reading Data
47. Model View Controller Updating Data
49. Add Albums • Press Ctrl+C to stop the server • rails generate scaffold Album title year • bin/rake db:migrate • bin/rails server • http://localhost:3000/albums
52. Rails Console • Open a new terminal tab • bin/rails console
54. Resources
55. Learn More Ruby • Programming Ruby 1.9 & 2.0 • The “PickAxe” Book • Dave Thomas, with Chad Fowler and Andy Hunt • The Ruby Way • Hal Fulton
56. Learn Ruby Online • Try Ruby • http://tryruby.org • Ruby Koans • http://rubykoans.com • Ruby has damaged your karma.
57. Learn More Rails • Ruby on Rails Tutorial • Michael Hartl • https://www.railstutorial.org/book/ • Rails Crash Course • Anthony Lewis
58. Local Community • Austin on Rails - 4th Tuesdays • http://austinonrails.org • Austin.rb - 1st Mondays • http://austinrb.org
59. GitHub • https://github.com • Social Coding • Create a free account • Read the GitHub Bootcamp
60. Heroku • http://www.heroku.com • Simple Web App Deployment • Create a free account • Look over the Getting Started info
61. Thank You!